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<br />Precision approach path indicator (P API): an airport lighting facility in the <br />terminal area navigation system used primarily under VFR conditions. The P API <br />provides visual descent guidance to aircraft on approach to landing through a single <br />row of two to four lights, radiating a high intensity red or white beam to indicate <br />whether the pilot is above or below the required approach path to the runway. The <br />PAPI has an effective visual range of 5 miles during the day and 20 miles at night. <br /> <br />Precision approach procedure: a standard instrument approach procedure in <br />which an electronic glide slope is provided, such as ILS. <br /> <br />Precision instrument runway: a runway having a existing instrument landing <br />system (ILS). <br /> <br />Reliever airport: an airport to serve general aviation aircraft which might <br />otherwise use a congested air-carrier served airport. <br /> <br />Runway end identification lights (REIL): an airport lighting facility in the <br />terminal area navigational system consisting of one flashing white high intensity <br />light installed at each approach end corner of a runway and directed toward the <br />approach zone, which enables the pilot to identify the threshold of a usable runway. <br /> <br />Runway Protection Zone (RPZ): an area off the runway end to enhance the <br />protection of people and property on the ground. <br /> <br />Runway Safety Area (RSA): a defined surface surrounding the runway prepared <br />or suitable for reducing the risk of damage to airplanes in the event of an <br />undershoot, overshoot, or excursion from the runway. <br /> <br />Runway Threshold: the beginning of that portion of the runway available for <br />landing. In some instances, the landing threshold may be displaced. <br /> <br />Threshold Elevation: the elevation of the runway threshold, expressed in feet <br />above mean sea level (MSL). <br /> <br />Touch-and-Go Operations: aircraft executing simulated approaches or low passes <br />at the airport. <br /> <br />Touchdown Zone: the first 3,000 feet of runway beginning at the threshold. <br /> <br />Vector: a heading issued to an aircraft to provide navigational guidance by radar. <br /> <br />Victor airway: a control area or portion thereof established in the form of a <br />corridor, the centerline of which is defined by radio navigational aids. <br /> <br />B-4 <br />